rochester



M 27 1930 F. L.| CRADDOCK 1 MIXING DEVICE Original Filed Jqly 31, 1923 3 Sheets-Sheet 1 JIM ATTORNEY .F. L. CRADDOCK 3 Sheets-Sheet 2 May 27, 1930.

MIXING. DEVICE Otiginal Fil ed July 51, 1923 INVENTOR fiecigric'lcL flmddod' M ATTORNEY i F. L. QCRADEYDOCK I May 27, 1930. MIXING DEVICE Re. v17,683

Original Filed July a1, 1925 5 SheetS Sheet 5 [NVENTOR ATTORNEY ing at the top of a tank,

0 and pulverized when striking t Reiuued M. 2 1930 UNITED, STATES PATENT IBEDEBIGI L. GRLDDOCK, Ol ROCHESTER,

NEW YORK, assro'non ro MIXING EQUIP- nmur comm, me, or menus-ran, NEW yoax, A conrona'rrox or NEW YORK nrxme nnvron Orlrlnal application filed July 81, 1883, Serial No. 654,825. Renewed April 4 1928. Original Io.

1,708,099, dated February 26, 1989. 409,721.

My invention particularly relates to the type of apparatus which is used to stir toether and mix food products and other iquids or solids and mixtures of various ma- 5 terials.

' A problem which I seek to solve is to provide a mixing device having one or all of the following advantages :low first cost, adjustable, eflicient, light weight universal applicability, not liable to accidental damage.

I have found that mixes vary in viscosity andspecific gravity and that the'position of the mixing propeller or equivalent has to be adjusted in depth of submersion. The axis of rotation is in a vertical plane external to.

- the centre of the tank for the most eflicient results. I

I have also found that'the size and'shape of the mixing tank affects the location of the ideal position for the mixing propeller, although usuall the propeller shaft works best at a small ang e from the perpendicular. The propeller stream is thus abruptly deflected when striking the bottom and gently deflected by the side of the tank, providing a method for emulsifying and pulverizing the particles ofthe mix in contrast 'to the gentler blending and stirring effected in the apparatus of my patent for angular fluid mixers No. 1,548,935, issued August 5, 1925, in which the ropeller stream is usually horizontal.

I ave also found that in some cases where air bubbles'and froth are desired in the mix.

difierentadjustments are required from those where aeration of the mix, or merely a thorough mix, is the desideratum. I

The ob'ect of my invention is to rovide an improve mixing device desi ed I or mountaving a screw propeller extending down into the tank and designed to cause t e propeller stream to impinge upon a side of the. tank whereby the coaction of the propeller stream and the side wall will cause a rolling action of the mix and successively brin all parts ofthe mix into contact with a W other parts thereof. Thus also referably causing successively every part 0? the mix to be-abrupl'tly deflected e bottom of the tank.

and

Application for reissue filed November 25, 1929. Serial No.

ing device, preferably at the edge of a tank and preferably by means of an adjustable joint whereby the angle of the propeller stream with respect to the side wall may be varied. A universal joint designed for locking in any desired position to facilitate both horizontal and' vertical adjustment of the propeller stream is the preferred construction. y.

Another object of my invention is to provide a mixing device which is universally adjustable and lockable into positions whereby the propeller stream will impinge upon and coact with the side wall of a-tankto cause a rollin as well as arotation about a vertical or a orizontal axis alone.

Another object of my invention is to provide'a mixing device which will fulfill the above requirements in an improved manner, preferably using a standard motor, etc., and requiring a minimum of special parts. Another ob ect is to provide improved constructional details for such a device, as may a pearfrom the following description of a pre erred construction, and be pointed out in the claims. Referring to the accompanying drawings: Fig. 1- is a side view, partly in section of my mixing device clamped to a fragment of the edge of a mixing tank, which is indicated in double dot and single dash lines;

Fig. 2 is a section taken on the line 22 of Fig. 1, particularly showing the clamp and adjustable mounting;'

Fig. 3 is a section taken on the line 3-3 of Fig. 1, showing additional details of the mounting;

- Fig. 4 is a section of the adjustable mountin? taken on the line 4-4 of Fig. 3;

ig. 5 is an enlarged sectional view of the thrust bearing and coupling between the motor shaft and the hollow extension thereof;

Fig. 6 is an enlarged sectional view of the hand turn gritp nut for the telescopic mixing t;

propeller sha I Fig. 7 is a view of the pro eller and protector ring, taken on the line 7 of Fig. 1;

loo

' the line-of the propeller bottom 0 15 vided with the hand-wheel 7 go washer 15,

so ability is equivalent to socket joint and is universal 40 form an outboard bearin 45 thrust bearing to take the upward thrust to ture, etc.

55 thrust bearing.

60 33 are pinned together b j is of conical form 66 cal lowerend 47 of hollow shaft 33 upon shaft Fig. 8 is a cross-section, taken onthe line 8-8 of Fig. 7, p n

Fig. 9 is a diagrammatic plan view of a tank provided with an arrow, A, indicating stream in one of its positions coacting with the side and the tank, and r Fig-10 isa section of Fig. 9 takenon the effective line 1010. I

The numeral 1 indicates the right-hand side of any tank in which the mix is to be made and upon which is fastened the clamp 3, made of cast aluminum, and detachably held in place by means of the hand-screw 5 which is pro.-

The upper portion of the clamp 3 is provided with a hemispherical recess 9 in which is placed a hemispherical mating casting 11, providedwith a slot 13, in which is placed a having two downwardly extending lugs 17-17 to prevent rotating of the I washer with respect to the casting 1.1.

A bolt 19, having its head at the lower end, in a recess in clamp 3, extends upwardly g5 through. washer 15 and is provided with a conventional washer 21 and nut 23.

Thus the clam 3 and the castingl 11 may be adj'ustably locked-in position wit respect to each other by the nut 23. This adjust-'- that of a ball and for any practical position of the mixing propeller 25in the tank 1. Y I

The casting 11 extends as indicated and surrounds the lower portion of 'afmotor 27, to

which it is attached by 7 screws 29-29 which enter the tap d holes 31- -31 found in standard motors 0 this type.

. The'casting 11 also extends downwardly to which contains a grease impregnated woo en bushin 32 for the-hollow portion33 of the propel er shaft 33-35. y

At the lower portion of the motor 27, a ball 37 is provided, which abuts against the motor 27 and the hollow shaft 33 from the propeller, 25, which, when operating, is usually found to be greater than the weight of the motor arma-' It is better to have the propeller thrust the mix down, both to facilitate mixing and to sup ort the weight of the armature or rotor, sha and propeller and thus reducethe load which must be sustained by a This arrangement also reduces the stresses ;on the clamp and the side of the tank and thus reduces breakage of the parts in operation;

The motor shaft 39 and the hollow shaft a pin 41, and the hollow shaft 33 1s provi ed with a knurled w haiidlhold- 43- and a knurled hand-clamp nut 45. The inside of the lower end of the nut 45 to compress the slotted coni- 35 and provide telescopic adjustment between hollow shaft 33 and shaft 35 which carries the propeller 25.

Occasionally the propeller 25, which is pinned to shaft 35 by a pin 49, may accidentally be brought into contact with the mixing tank, and toprevent damage to the tank, or the propeller, a removable spring shroud ring 51 is sprung onto the propeller blades 53-5353 and seated in suitable notches 55-'-55-55.

I claim:

1. The combination of a tank-having a side and containing a mix, a mixing device mounted at the top of the tank, provided ,With a screw propeller extending down into the tank and revolvable about an axis in a vertical plane external to the centre axis of the adjacent mix in the tank, whereby a propeller stream .of the mix may impinge upon and coact with the side of thetank to effect a rolling of the mix and a thorough mixture thereof. 2. The combinat-ionflof a tank havin a side and containing vided with a universally adjusta le mounting designed for locking in any desiied position, mounted at the top of the tank, providedwith a mix,a mixin 'dev'i e protank and revolvable about an axis in a vertical plane external to'the centre axis of the tank, whereby propeller stream of the mix may impinge upon and coa t with the side of the tank to efiect a rolling of the mix and a thorough mixture thereof. i 3. The combination of a tank having a side Wall and a bottom and containing a mix, a mixing device mounted at the top of the tank, provided with a screw propeller extending down into the tank and revolvable about an axis in'a vertical plane external to the centre axis of the adjacent mix in the tank, whereby a propeller stream of the mix may impinge upon and coact with wall and the centre axisof the tank,-whereby a pro- 'peller stream of the mix Ina impinge uponand coact with the side and t tank'to effect a combined action consisting of a rolling of the mix at the side, a pulverizing at; the bottom, and a thorough mixture there- 0 i v '5. A mixing device provided ,with attachment means and designed for mounting at the top of a tank having a side, provided with a screw propeller designed to extend down into e bottom of the y and containing in a vertical plane external to the centre axisof the tank, whereby a propeller stream of a mix may impinge upon and coact with the side of the tank to effect a rolling of the mix and a thorough mixture thereof.

6. The combination of a tank having a side a mix, a mixin device mounted at the top 0 the tank'inclu ing a telescopic shaft provided with a screw propeller extending down into the tank and revolvable about an axis in a vertical plane external to propeller extending the centre axis of the adjacent mix in the tank at a preferred height fixed by the then extension of the telescopic shaft, whereby a propeller stream of the mix may impinge upon and coact at a preferred height with the side of the tank to effect a rolling of the mix and a thorough mixture thereof.

7. The combination of a tank having a side and contamlng a mix, a mixing device mountsc'rew propeller extending down into the tank and revolvable about an axis in a vertical plane external to the centre axis of the adj acent mix in the tank, whereby'a propeller stream of the mix may impinge upon and coact with the side of the tank to effect a rolling of .the mix and a thorough mixture thereof, and means to adjust the position of the propeller axis with relation to the axis of the mix.

' 8. The combination of a tankhaving a side and containing a mix, a mixing device mounted upon a ball and socket ad'ustable bracket at the top of the tank provi ed with a screw down into the tank and revolvable about an axis in a vertical plane external to the centre axis of the adjacent mix in the tank, whereby a propeller stream of the mix may impinge upon and coact withthe side of the tank to effect a rolling of the mix and a thorough mixture thereof.

9. The combination of a tank having a side I and containing a mix, a mixing device mounted upon a. ball and socket adjustable bracket at the top of the' tank,'provided with a telescopic shaft carrying a screw propeller extending down into the tank and revolvable.

about an axis ina vertical plane external to the centre axis of the adjacent mix in the tank, whereby a propeller stream'of-the mix may. impinge upon" and coact with-the side of the tankto effect a rollin ofthe mix and a thorough mixture thereo 10. Mixing apparatus-comprising a vrotatable shaft, a propeller thereon, and means ca able of being rotated around a substantia y vertical axis for adjustment for suporting said shaft so as to extend obliquely into a tank through the top thereof in a vertic'alpl'aneexternalto the vertical centre axis ofthetank.

' device comprising a shaft 11. A mi in having a propefier-thereon, supporting means therefor, designed to be rotated around a substantially vertical axis for adjustment and mounted on the edge of a mixing tank, whereby the shaft may be adjusted to extend downwardly at an angle to any vertical plane wlllllfih includes the central vertical axis of the 133, v

12. A mixing device comprising a shaft havin a propeller thereon, and means for rotata ly mounting said shaft so as to project downwardly into a'mixing tank comprising a bracket for engaging the top of the tank and means providin for angular adjustment of said shaft relative to the plane defined by said bracket and the central axis of the tank.

13. A mixing device comprising a shaft having a propeller thereon, and means for rotatably supporting said shaft so as to extend into a tank through the top thereof, said means providing for adjustment of said shaft in a vertical radial plane'of the tank and in a ed at the top of the tank, provided with a plane angular to said radial plane.

14:. A mixing device having asupport provided with attachment means for secuning the same to a mixing tank, a shaft rotatably nection between said motor and said 'bracket providing for universal adjustment of the inclination of said shaft relative to said bracket, and including-means to sustain said shaft to extend in a direction external to the centre axis of the tank.

- 16. The combination of a tank provided with a central vertical axis, having a side and a bottom, a mixing device mounted at the top of said side and provided with a mixing shaft carrying a mixing member extending .down obliquely into the tank and revolvable about an axis at one side of saidcent-ral vertical axis.

a bottom a mixing device mounted at the top of said side and provided with a mixing shaft carryina mixing member and extending down 0 liquely into the tank and means to fix the obliquity thereof in any preferred pe sition at one side of said central vertical axis. j

. 18. The combination of a tank provided with a central vertical axis, havin a side and a bottom, a-mixing device mounte at the top of the tank and having a telescopic shaft extending down obliquely into the tank revolvable about an obli ue axisiat onfiside of said central vertical axis and provided at its lower portion with a mixing member.

4 dimes 19. The combination of .a tank provided with a central vertical axis, having a side and a bottom, and containing a mix, a mixing device mounted at the tog of the tank, extending 5 down into the mix, an a propelling means at the extension revolvable about an axis external to any vertical plane passing through the center of the tank "and desi ed to create a stream of the mix along an o lique axis at one side of the said verticalaxis.

20 The combination of a tank provided with a central vertical axis, having a side and a bottom, and containing a mix, a mixing device mounted at the top of the tank, secured at the edge thereof, extending down into the mix and a propelling means at the extension revolvable about an axis external to any vertic'al plane passing through the center of the tank and designed to create a stream of the mix alon an oblique axis at one side of the said vertical axis. a i V 21. A mixing device designed to be mounted at the top of a tank provided with a central vertical axis, having a side and a bottom and containing a mix, said device comprising a mounting means therefor for securing same on said tank, a driving means provided with an extension from said mounting means, and a propelling means at the lower portion of the V extension, revolvable about an axis external to any VerticaI plane. passing through the a center of thetank and designed to create a stream in the along. an oblique axis at one side oft-he vertical axis. '3 22, A mixing device designed to be mounted at the topof a tank-provided with a central vertical axis, having a side and a bottom and containing a mix, said device comprising amounting means therefor for securing same on; said tank, an electric motor, a downwardly extending'shaft driven thereby',"carrying ascrew propeller, revolvable about an axis externalto any vertical plane pass through the center, of the tank and desi ne to create. a stream in the mix along an o liq ue axis at 1 one side of the vertical axis. 23. A mixing" device designed for use with a tank for ,containing a mix, comprising a rotatable shaft having propelling means; thereon, and means for mounting said device at such atank. so as to directand hold; said shaft extending downwardly into such atank along'an oblique axis-[at one side of the cen tral vertical axis of such a tank. 7 5 FREDERICK L. CRADDOCK. 

